Lesson 29 Paired prefixes

mis + spelled	= misspelled	ad + sume	= assume
re + spelled	= respelled	re + sume	= resume
dis + solved	= dissolved	sub + ceed	= succeed
re + solved	= resolved	ex + ceed	= exceed
com + mission	= commission	ad + cess	= access
ad + mission	= admission	pro + cess	= process
ad + tend	= attend	com + lapse	= collapse
pre + tend	= pretend	re + lapse	= relapse
ob + fense	= offense	com + ruption	= corruption
de + fense	= defense	ex + ruption	= eruption

1.	Look at the two words in each pair. Doe they have the same root? _____ Do they have the same prefix? _____ Do both words contain a double consonant when the prefix and root are joined? _____
2.	Write the three words in which a double consonant results without any change in the spelling of the prefix. _____________   _______________   _____________
3.	How many words have double consonants caused by an assimilated prefix that has been changed to match the first letter of the base word or root? _____

Lesson Generalization Some double consonants occur because the last letter of the prefix is the same as the first letter of the base word or root: misspelled. Most double consonants occur because the prefix is assimilated. The last letter of the prefix changes to match the first letter of the base word or root: ad + tend = attend. Mnemonic device: Associating the words in each pair will help you to remember that one of the double consonants belongs to the prefix, and one belongs to the root or base word.

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